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Can you share pictures of your boards?

You can do better than that pretty easily. Do you have flux? I recommend the grease style as it's easy to work with. Put the flux all over those pins where they are attached to the PCB and apply heat. Most of the solder will just straighten out on the pins. If any clumps pins together just...

Adding more positive feedback for @buenrip. Ordered Cowboys of Moo Mesa bootleg. It was shipping fast and packaged well. Communication was great.

I was just wondering how you had it setup, not recommending a setup. OSSC should all be the same in terms of functionality. They might use different quality components though. I would try this because it's inexpensive. https://a.co/d/a7bV1Lv

How is it plugged in when there are 5 cables for component and 6 for RGB/s? You plugged it into the component inputs and the also hooked the yellow to the composite input I'm guessing? Your have the TV input tuned to the composite input I would also guess. I'm no expert on this but I will...

And how do you have it hooked up right now? You can look into hd retrovision Genesis 2 component cables. They might work if the TV/monitor supports 240p. If they don't work with that TV you will need a scaler. The hd retrovision cable will let you connect to the scaler. The retrotink2x or...

What inputs are on that TV/monitor?

The display you are using supports RGB/s?

What MVS are you using? Do you happen to have an mv1b? I'm curious why my carts just don't work on multiple mv1b.

I opened a thread for cart issues. Mine go to crosshatch often.

That s1 ROM doesn't need pins 2/24 swapped?

I still don't understand why the cart doesn't work in any mv1b. I don't even get crosshatch. I get flashing screen like no bios. I might have to open another thread to focus on that issue and what could cause it.

Thanks. I've been leaning in that direction. The carts should be clean by now. I have really worked on them and I'm not seeing any black come up on the swab when using de-oxit. Both games can be played to the end, even in the shells; so I think they are assembled well. The carts are sensitive...

I don't agree that 27C160 for C1 and C2 is a waste. 27c160 are cheap are readily available. You can get 27C160 for $2 each or less. It's not a big deal to double the ROMs.

I already have the S ROM 2/24 PINS cut with wires running to the opposite pin. I have already pulled the C ROMs and S ROM and verified them. I have checked for shorts and cut traces and I don't find any. I always use flux for all soldering. I don't know how anyone can solder without flux. It...

I spent a lot of time on this last night and today. I made some progress, but I'm more confused now... I pulled the C ROMs and verified them. They were all messed up. It's possible I flashed the wrong ROMs. I have not investigated it fully. I programmed new C ROMs and installed them. The...

I do have unibios 4.0 free. Graphics become garbage. It never actually hard crashes. After garbage graphics, music still plays. Coin insert works (plays chime). No other controls seem to work once the graphics go to garage. Can't like start the game in the background. One time I saw the...

I went back and checked the traces on all the V ROMs. They test good. Now. Some more rings were damaged and I repaired. I'm getting past the Hoffman credits/intro but crashing with garbage all over the screen. Right after.

Thanks for the suggestions and p ROM. I checked for short under s1 and nothing there. Neo 273 seems clean? I cleaned it again. I pulled my p ROM and compared to yours. It matches perfectly. I put it back in and and now it boots will clear graphics but fails once attract would normally...

So far, @pierpa has suggested: I will do this but the failure of Shinobi on MV1B is strange. Edit: Shinobi works on MV1A as well. Golden Axe works on nothing still. I'm out of motherboard variants so I'll pull P1 and check it out.